SLIDE 1
Radiation’s Role in Accelerating Galactic Outflow
- Galactic Outflow : Importance in Galaxy Evolution
- Galaxy properties: galaxy luminosity function
- Enrichment of IGM
- Star formation feedback
Radiations Role in Accelerating Galactic Outflow 2019 Athena++ User - - PowerPoint PPT Presentation
Radiations Role in Accelerating Galactic Outflow 2019 Athena++ User - - PowerPoint PPT Presentation
Radiations Role in Accelerating Galactic Outflow 2019 Athena++ User Meeting | Xiaoshan Huang ( Shane W. Davis, Dong Zhang) Radiations Role in Accelerating Galactic Outflow Galactic Outflow : Importance in Galaxy
SLIDE 2
SLIDE 3
Radiation’s Role in Accelerating Galactic Outflow
- Galactic Outflow : Observed Properties
- (Spilker et al 2018)
(Walter et al 2017) OH doublet
- Velocity:
- Cold gas: Molecular temperature
NGC253
SLIDE 4
Radiation’s Role in Accelerating Galactic Outflow
- Galactic Outflow : Driving Mechanism. Simulation Study
- Schematic Picture
- Entrainment in hot wind
(Scannapieco 2015)
SLIDE 5
Radiation’s Role in Accelerating Galactic Outflow
- Galactic Outflow : Driving Mechanism. Simulation Study
- Entrainment in hot wind
(Scannapieco 2015)
- IR Radiation from SF regions
(Zhang et al 2018)
surviving time: when cloud lose half of its initial mass
- E
- IR
- C
- A
- Magn
- B
- UV
SLIDE 6
Athena++ RHD code
- Directly Solve the multi-band RT Equation
- Couple with Hydrodynamic Equation
- Reduced Speed of Light Approximation
SLIDE 7
Radiation’s Role in Accelerating Galactic Outflow
UV flux
- utflow
- utflow
- utflow
- Set-up
close to starburst region
- Passive Scalar to track dust
- Cloud-following Frame
- Initial random perturbation on density
- Uniform incoming radiation flux
Fiducial Run
SLIDE 8
Radiation’s Role in Accelerating Galactic Outflow
Density Compression by radiation pressureèvolume minimumèRe-expand by gas pressure
SLIDE 9
Radiation’s Role in Accelerating Galactic Outflow
- Cloud surviving time:
passive scalar: dust fraction
- f cell
Radiation Flux x direction
SLIDE 10
Radiation’s Role in Accelerating Galactic Outflow
A very favorable acceleration condition
surviving time: UV radiation << IR radiation
IR radiation UV radiation
SLIDE 11
Radiation’s Role in Accelerating Galactic Outflow
- Take-away
- Cold cloud being accelerated by UV radiation has significant shorter
surviving time compared to IR radiation
- Future Work:
- Background condition?
- What fraction of UV radiation in a mixing flux will destroy the cloud?
- Cosmic Rays?
SLIDE 12
Radiation’s Role in Accelerating Galactic Outflow
- Dust escape from boundary?
solid: dashed:
SLIDE 13
Dust sublimation happens when mixing with background
dust temperature
(only showed region with dust)
cloud mass evolution dusty density distribution v.s. hot dust density
T/T0
SLIDE 14
Radiation’s Role in Accelerating Galactic Outflow
IR radiation UV radiation
- Optical depth
SLIDE 15
Radiation’s Role in Accelerating Galactic Outflow
- Resolution
SLIDE 16
Radiation’s Role in Accelerating Galactic Outflow
- Dimension
SLIDE 17
Radiation’s Role in Accelerating Galactic Outflow
UV flux
- utflow
- utflow
- utflow
- Set-up
close to starburst region
- Passive Scalar field to track dust
- Cloud-following Frame
- Initial random perturbation on density
- Uniform incoming radiation flux
Fiducial Run
SLIDE 18
Radiation’s Role in Accelerating Galactic Outflow
A very favorable acceleration condition Hot Wind IR radiation 0.1Myr 0.1Myr
surviving time: UV radiation << IR radiation
(Zhang et al 2018) IR radiation UV radiation , Shane W. Davis)
SLIDE 19
Radiation’s Role in Accelerating Galactic Outflow
- Galactic Outflow : Driving Mechanism. Simulation Study
- Entrainment in hot wind
(Scannapieco 2015)
- IR Radiation from SF regions
(Zhang et al 2018)
- surviving time: when cloud lose half of its initial mass